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new coordinate calculations for head penumbra filter

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This commit is contained in:
Craig Hansen-Sturm 2014-09-04 18:10:29 -07:00
parent fb8b3020e5
commit fe0b9825d0
1 changed files with 43 additions and 22 deletions
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65
assignment-client/src/audio/AudioMixer.cpp
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@ -141,7 +141,7 @@ int AudioMixer::addStreamToMixForListeningNodeWithStream(PositionalAudioStream*
float weakChannelAmplitudeRatio = 1.0f;
bool shouldAttenuate = (streamToAdd != listeningNodeStream);
if (shouldAttenuate) {
// if the two stream pointers do not match then these are different streams
@ -306,40 +306,61 @@ int AudioMixer::addStreamToMixForListeningNodeWithStream(PositionalAudioStream*
}
if (_enableFilter && shouldAttenuate) {
glm::vec3 relativePosition = streamToAdd->getPosition() - listeningNodeStream->getPosition();
if (relativePosition.z < 0) { // if the source is behind us
glm::quat inverseOrientation = glm::inverse(listeningNodeStream->getOrientation());
glm::vec3 rotatedSourcePosition = inverseOrientation * relativePosition;
// project the rotated source position vector onto the XZ plane
rotatedSourcePosition.y = 0.0f;
// produce an oriented angle about the y-axis
bearingRelativeAngleToSource = glm::orientedAngle(glm::vec3(0.0f, 0.0f, -1.0f),
glm::normalize(rotatedSourcePosition),
glm::vec3(0.0f, 1.0f, 0.0f));
// if the source is in the range [-pi/2,+pi/2] (e.g, -Z from the listener's perspective
if (bearingRelativeAngleToSource <= -PI_OVER_TWO || bearingRelativeAngleToSource >= PI_OVER_TWO)
{
AudioFilterHSF1s& penumbraFilter = streamToAdd->getFilter();
// calculate penumbra angle
float headPenumbraAngle = glm::angle(glm::vec3(0.0f, 0.0f, -1.0f),
glm::normalize(relativePosition));
const float FULL_POWER = 1.0f;
const float SQUARE_ROOT_OF_TWO_OVER_TWO = 0.71f;
const float HALF_POWER = SQUARE_ROOT_OF_TWO_OVER_TWO;
const float QUARTER_POWER = /*HALF_POWER * */HALF_POWER;
if (relativePosition.x < 0) {
headPenumbraAngle *= -1.0f; // [-pi/2,+pi/2]
}
const float SQUARE_ROOT_OF_TWO_OVER_TWO = 0.71f; // half power
const float ONE_OVER_TWO_PI = 1.0f / TWO_PI;
const float FILTER_CUTOFF_FREQUENCY_HZ = 4000.0f;
const float FILTER_CUTOFF_FREQUENCY_HZ = 1000.0f;
// calculate the updated gain, frequency and slope. this will be tuned over time.
const float penumbraFilterGainL = (-1.0f * ONE_OVER_TWO_PI * headPenumbraAngle) + SQUARE_ROOT_OF_TWO_OVER_TWO;
const float penumbraFilterGainR = (+1.0f * ONE_OVER_TWO_PI * headPenumbraAngle) + SQUARE_ROOT_OF_TWO_OVER_TWO;
// calculate the updated gain, frequency and slope.
const float penumbraFilterFrequency = FILTER_CUTOFF_FREQUENCY_HZ; // constant frequency
const float penumbraFilterSlope = SQUARE_ROOT_OF_TWO_OVER_TWO; // constant slope
const float penumbraFilterGainL = (bearingRelativeAngleToSource <= -PI_OVER_TWO) ?
((+1.0 * ONE_OVER_TWO_PI * (bearingRelativeAngleToSource + PI_OVER_TWO)) + FULL_POWER) :
((+1.0 * ONE_OVER_TWO_PI * (bearingRelativeAngleToSource - PI)) + HALF_POWER);
const float penumbraFilterGainR = (bearingRelativeAngleToSource <= -PI_OVER_TWO) ?
((-1.0 * ONE_OVER_TWO_PI * (bearingRelativeAngleToSource + PI_OVER_TWO)) + QUARTER_POWER) :
((-1.0 * ONE_OVER_TWO_PI * (bearingRelativeAngleToSource - PI)) + HALF_POWER);
qDebug() << "penumbra gainL="
<< penumbraFilterGainL
<< "penumbra gainR="
<< penumbraFilterGainR
<< "penumbraAngle="
<< headPenumbraAngle;
float distanceBetween = glm::length(relativePosition);
qDebug() << "avatar="
<< listeningNodeStream
<< "gainL="
<< penumbraFilterGainL
<< "gainR="
<< penumbraFilterGainR
<< "angle="
<< bearingRelativeAngleToSource
<< "dist="
<< distanceBetween;
// set the gain on both filter channels
penumbraFilter.setParameters(0, 0, SAMPLE_RATE, penumbraFilterFrequency, penumbraFilterGainL, penumbraFilterSlope);
penumbraFilter.setParameters(0, 1, SAMPLE_RATE, penumbraFilterFrequency, penumbraFilterGainR, penumbraFilterSlope);
penumbraFilter.render(_clientSamples, _clientSamples, NETWORK_BUFFER_LENGTH_SAMPLES_STEREO / 2);
}
}